<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div class="box">
      <div class="box1">
        <div class="box3"></div>
        <div class="box4"></div>
      </div>
      <div class="box2">
        <div class="box6">
          <div class="box5"></div>
          <div class="box8"></div>
        </div>
        <div class="box7">
          <div class="box9"></div>
          <div class="box10"></div>
        </div>
      </div>
    </div>
  </body>
  <style>
    .box {
      width: 600px;
      height: 200px;
      float: left;
      background: white;
    }
    .box1 {
      width: 200px;
      height: 200px;
      float: left;
      background: white;
    }
    .box2 {
      width: 400px;
      height: 200px;
      float: left;
      background: white;
    }
    .box6 {
      width: 400px;
      height: 100px;
      float: left;
      background: white;
    }
    .box7 {
      width: 400px;
      height: 100px;
      float: left;
      background: white;
    }
    .box3 {
      width: 200px;
      height: 100px;
      float: left;
      background: red;
    }
    .box4 {
      width: 200px;
      height: 100px;
      float: left;
      background: pink;
    }
    .box5 {
      width: 250px;
      height: 100px;
      float: left;
      background: greenyellow;
    }
    .box8 {
      width: 150px;
      height: 100px;
      float: left;
      background: grey;
    }
    .box9 {
      width: 150px;
      height: 100px;
      float: left;
      background: yellowgreen;
    }
    .box10 {
      width: 250px;
      height: 100px;
      float: left;
      background: yellow;
    }
  </style>
</html>
